A couple of days ago I came across this terrifying presentation from John Graham-Cumming.
Here is the outcome for the three most important for me.
Most of the functionality was in place: the timeline, friend and followers. From the various buttons on the tweets and the timeline pages, the reply did work but not the fav button.
The direct message and delete buttons did not work either. Same with the drop down where you select a follower to dm, and finally, the followers and trending topics buttons.
But all these are rather trivial. Because most of the tweet buttons replicate user behavior (putting the @ sign in front of another user name for a reply, or the d letter for a direct message).
Not being able to fav, or, more importantly, to delete is a loss, but not a major one.
Things are worse in Facebook: while Home, Profile, Friends and Settings are accessible, the inbox and chat are not.
Also, from the bottom bar, the applications menu is inaccessible. Most of the edit links and buttons don’t work either and finally the status updates, link sharing , photos etc cannot be submitted.
A small gallery with pics of the failure areas of the above web applications follows